package com.imooc.netty.webscoket;

import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.group.ChannelGroup;
import io.netty.channel.group.DefaultChannelGroup;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import io.netty.util.concurrent.GlobalEventExecutor;

import java.time.LocalDateTime;

/*
处理消息的handler
TextWebSocketFrame:在netty中,是用于为websocket专门处理文本的对象,frame是消息的载体
 */
public class ChatHandler extends SimpleChannelInboundHandler<TextWebSocketFrame> {
//用于记录和管理所有客户端的channel
    private static ChannelGroup clients=
        new DefaultChannelGroup(GlobalEventExecutor.INSTANCE);
    @Override
    protected void channelRead0(ChannelHandlerContext ctx, TextWebSocketFrame msg)
            throws Exception {
        //获取客户端传输过来的消息
    String content=msg.text();
        System.out.println("接收到的数据:"+content);
//    for (Channel channel:clients){
//        channel.writeAndFlush(
//                new TextWebSocketFrame("[服务器在:]"+ LocalDateTime.now()
//                        +"接收到消息,消息为:"+content));
//    }
    //下面这个方法,和上面的for循环,一致
    clients.writeAndFlush(
            new TextWebSocketFrame("[服务器在:]"+ LocalDateTime.now()
                    +"接收到消息,消息为:"+content));
    }
/*
当客户端连接服务端之后(打开连接)
获取客户端的channel,并且放到ChannelGroup中去进行管理
 */
    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {

        clients.add(ctx.channel());
    }

    @Override
    public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
        //当触发handlerRemoved,ChannelGroup会自动移除对应客户端的channel
  //      clients.remove(ctx.channel());
        System.out.println("客户端断开,channel对应的长id为"+ctx.channel().id().asLongText());
        System.out.println("客户端断开,channel对应的短id为"+ctx.channel().id().asShortText());
    }
}
